Attaching a dispensing valve to a pressurized dispenser

ABSTRACT

A dispensing valve is secured to a standard dome of a pressurized dispenser through a lock ring and a depending plug portion of the dispensing valve housing. The lock ring, around an undercut section on its external radial surface, lies in conforming and compressive engagement with the inner radial surface of a bead which bounds the opening through the dome. The lock ring is forced tightly against the bead by the plug through complementary tapered surfaces of the two. The taper of the lock ring exceeds that of the plug to allow the plug to overtravel and elastically expand the lock ring during its assembly with the lock ring to be sure that an annular, radially outwardly extending flange of the plug underlies the extreme interior, axial end of the lock ring.

[ ATTACHING A DISPENSING VALVE TO A PRESSURIZED DISPENSER [75]Inventors: Merle G. Risdon, Norwalk; Ronald A. Meyer, Mission Viejo,both of Calif.

[73] Assignee: Sterigard Corporation, Irvine Industrial Company, SantaAna, Calif.

[22] Filed: Sept. 15, 1971 [21] Appl. No.: 180,646

1 51 July 17,1973

3,262,721 7/1966 Knight 285/DIG. 22 3,056,852 10/1962 Sachs 285/DlG. 221,041,445 10/1912 Dittrich 222/394 2,993,629 7/1961 Ruhnke 222/567 x3,270,924 9/1966 Kitabayashi 222/394 Primary ExaminerSamuel F. ColemanAssistant Examiner-Norman L. Stack, Jr. Attorney-E. Roderick Cline etal.

[57] ABSTRACT A dispensing valve is secured to a standard dome of apressurized dispenser through a lock ring and a depending plug portionof the dispensing valve housing.

:J-;S.(:CIL e lock i g around an d t tion on its exterd 6 67 24 5 nalradial surface, lies in conforming and compressive 1 fi g g i"335 556"6engagement with the inner radial surface of a bead which bounds theopening through the dome. The lock ring is forced tightly against thebead by the plug through complementary tapered surfaces of the two. [56]References Cited The taper of the lock ring exceeds that of the plug toUNITED STATES PATENTS allow the plug to overtravel and elasticallyexpand the 2,755,973 7/1956 Campbell 222/394 lock ring during itsassembly with the lock ring to be 3,434,636 3/1969 Kachman 222/567 surethat an annular, radially outwardly extending fi y et al 331 5 flange ofthe plug underlies the extreme interior, axial axton 2,214,732 9/1940Kraft 220/245 em! the lock 541,203 6/1895 Hall 220/245 10 Claims, 2Drawing Figures i l I 1 42 Patented July 17, 1973 I 3,746,218

.4 TTOPA/E V5 ATTACHING A DISPENSING VALVE TO A PRESSURIZED DISPENSERBACKGROUND OF THE INVENTION This invention relates in general to the artof dispensers for containing pressurized products and, more inparticular, to an improved means for attachment of a dispensing valveused to selectively discharge product from such a dispenser which ischaracterized by the compressive engagement of a plug and a lock ringagainst the inside of a standard dome's bead or curl.

Pressurized fluid dispensers are extremely popular. Briefly, pressurizeddispensers maintain a product to be dispensed under pressure forselective dispensation through a dispensing valve. The pressure ismaintained by a propellant. I

A standard pressurized dispenser has a body portion closed at its bottomby a closure cap and closed at its top by a dome. The dome has anannular bead or curl bounding an opening into the interior of thedispenser. This bead provides the purchase for the dispensers dispensingvalve. A typical assembly has a valve cup with an annular bead whichoverlies the complementary bead of the dome. The cup is attached to thedome by crimping the cup wall below the bead of the dome such that thevalve cups bead and the crimped areas of the cup wall clamp the domesbead between them. This crimping is done by multichucked crimpingapparatus which expands the portions of the wall of the valve cupradially outward beneath the bead of the dome. Because of therequirement for radial movement of the crimping chucks to crimp thevalve cup, spaces are left between crimped areas.

Often these uncrimped areas of the cup do not bear sufficiently hardagainst the sealant used between the cup and the dome to seal theinterior of the dispenser. Obviously, when the seal is ineffective adispenser must be rejected.

Moreover, the requirement for crimping of the valve cup to the domeentails considerable tool expense and maintenance problems. For example,the crimping chucks must be maintained in excellent condition andclosely synchronized if the desired number of crimp joints and degree ofcrimping are to be efiected.

Another problem confronted with the use of valve cups to mount thedispensing valve of pressurized dispensers is in the compatibility ofproduct with material from which the cups are made. While protectivecoatings are available, they are not always efi'ective because ofuncoated areas resulting from the fabrication of the cups. Because ofcost consideration, cup material, typically tinplated steel, is coatedin a preformed, flat condition. After coating, the cup is shaped andfabricated. During fabrication, a hole is punched for the stem of thedispensing valve. The wall of this hole is not coated. In addition, thebead and the annular channel between the bead and the stem mountingportion of the valve is formed which can cause cracking of the coatingto expose the metal. Metal exposure is also caused by scratching of thecoating which occurs during valve cup fabrication, feeding to assemblyareas, and assembly in a dispenser.

In short, the conversion of a flat sheet into a valve cup of complexconfiguration adversely affects the protective coating. Obviously, thenecessity for punching holes destroys the protective effect of thecoating in these areas. Moreover, crimping, bending and handling of thecups have a tendency to crack or otherwise expose the bare coating ofthe metal to the product within the dispenser.

As a consequence of the inability to fully protect valve cups withprotective coatings, compatibility between product and cups presentsserious problems. Chemical reaction between the cup and product andconsequent spoilage of product is an example of such an imcompatibilityproblem. Another problem is in anodic attack between two differentmetals which often occurs because of exposed metal of the valve cup.

Still another area where the prior art of valve cups have proventroublesome is in their assembly with the dispensing valve and to thedispenser. The great majority of dispensing valves previously used havetheir valve housing crimped to the valve cup. The valve cup issubsequently crimped to the dome of the dispenser. The necessity for adouble crimp can complicate assembly or comprimise the dispensing valve.

SUMMARY OF THE INVENTION The present invention overcomes problems ofproduct compatibility with metal valve cups, unreliability of the sealbetween the valve cups and their domes, relatively complicated assemblyprocedures, and the problems attendant with expensive amd maintenanceprone crimping equipment.

Briefly, the present invention contemplates the use of an annular lockring which, in assembly in a pressurized dispenser, bears in compressionagainst the inner surface of a standard bead or curl of the dispenserand is secured in this position and aided in its compressive engagementby a plug section of the dispensing valves housing.

More particularly, the present invention provides a dispensing valve fora pressurized dispenser which has a lock ring adapted to be received inthe opening bounded by a head or curl of a standard dome of a dispenserbody. The lock ring has an external diameter which exceeds the smallestdiameter of the head or curl with which it is to be used. The wallthickness of the lock ring is sufficiently thin to allow the bead tocontract the ring as a portion of the ring passes below the bead duringassembly. The plug of the dispensing valve housing is subsequentlyinserted in the lock ring to compressively engage it and urge it intotight, abutting relationship with the interior surface of the bead.

An even more particular form of the invention contemplates an improveddispensing valve which has a housing with a plug section. At the base ofthe plug section, an annular locking flange extends radially outwardfrom the adjacent annular surface of the plug section. In assembly, theflange at the base of the plug section engages the lock ring at its basealong the latters bottom marginal edge. This engagement preventspropellant pressure within the dispenser from forcing the housingthrough the top of the dome. The plug section is externally tapered withthe taper converging towards the bottom of the housing. The lock ringhas an inner annular surface for receiving the plug section which isalso axially tapered and which also converges in the same direction asthe taper of the plug section. The taper of the lock rings innersurface, however, is greater than that of the plug section. Thecomplementary tapers of the plug section on the lock ring allow the plugsection during assembly to move axially further inwardly of thedispenser than the position it occupies after assembly to be sure thatthe annular flange of the plug section completely clears the bottommarginal edge of the lock ring. A clearance is provided between anannular rib at the top of the tapered plug section and the axiallyadjacent portion of the lock ring to accommodate this overtravel. In acharged dispenser, propellant pressure will force the plug sectionupwardly with respect to the lock ring so that the annular flange of theplug section engages the lock ring. The annular rib at the top of theplug section has a diameter which is substantially the same as thediameter of the counterbore of the lock ring immediately adjacent thelock rings taper. The lock ring, where it engages the bead or curl, isundercut to conform to the surface of the bead it engages and tounderlie it. By having a portion of the lock ring underlying the beadwhen the lock ring is assembled, there is considerable resistanceagainst internal pressure within the dispenser.

The dispensing valve also has means for selectively discharging productfrom a pressurized dispenser. These means may include, for example, abarrel having a translatable plug spring-biased towards a closedposition, and an external actuator for unseating the plug from a tipseal allowing the product to be discharged through a nozzle.

These and other features, aspects and advantages of the presentinvention will become more apparent from the following description,appended claims and drawmgs.

BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is an elevational view, mostlyin half section and partly fragmented, of the dispensing valve andpressurized dispenser of the present invention; and

FIG. 2 is a fragmentary view in elevation in area 2 of FIG. 1,illustrating in detail the cooperation between the lock ring, plugsection and dome bead of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT With reference initially to FIG.1, a pressurized dispenser having a dispensing valve 12 and a dispenserpreassembly 14 is shown in elevation.

The dispensing valve includes a valve housing 15 and valve mechanism 16.The latter is adapted to selectively discharge productfrom the interiorof dispenser l0.

Dispenser preassembly 14 forms a container which has a body 18 closed bya bottom closure cap 20 and a cover or dome 22.

The dome is attached to the body of the dispenser as along an annularcircumferential seam 24. A similar seam provides the attachment ofbottom cap 20 to body 18. Dome 22 has an annular bead or curl 26 whichbounds an opening 28 through the dome and into the interior of thedispenser. The dome, body and body closure cap illustrated are typicalof those found as such in the prior art.

Housing 15 of dispensing valve 12 generally includes a barrel 30, a plugsection 32 and an intermediate or pedestal section 34. Valving mechanism16 is disposed in barrel for selective discharge of product from thedispenser. A passage 36 between a chamber 38 within the barrel providescommunication from the interior of the dispenser, through the pedestal,through the barrel and out of a nozzle 40 at the extreme anterior end ofthe barrel when valving mechanism 16 is actuated.

Plug section 32 is secured in place on dome 22 through a cooperatinglock ring 42. The plug section is hollow for the passage of productthrough it. Lock ring 42 for its part compressively engages the interiorradial surface of bead 26. A skirt 33 extends from the lock ring properto cover the dome and provide for means attaching an overcap. An overcapis used for keeping the valve clean, decorative purposes, and to preventinadvertent discharge of product as during shipment.

FIG. 2 illustrates more clearly plug 32 and lock ring 42. The lock ringhas an annular undercut portion 46 which conforms in shape to theabutting curved surface of bead 26. In a practical example, the undercutof section 46 on a radius basis was 0.020 inch with a polyethylene lockring.

The inner axial annular surface of lock ring 42, indicated by referencenumeral 48, is axially tapered with the taper converging towards thebottom of the dispensing valve. An end 50 of the lock ring defines anannular shoulder for engagement by a cooperating annular rib or flange52 of plug 32.

Plug 32 has an externally tapered, annular surface 54 which converges inthe same direction as tapered surface 48 of lock ring 42, but not asfast. Stated in different words, the taper of the interior surface ofthe lock ring is slightly greater than the taper of the exterior surfaceof the plug. In assembly, as shown in FIG. 2, the exterior annularsurface of plug 32 bears in compressive engagement against the lowerportion of surface 48 of the lock ring to force the lock ring properinto intimate compressive engagement with bead 26 to effect a sealthere, and to effect a seal along and around the engaged surfaces. Abovethe annular zone of compressive engagement between the tapered surfacesof the lock ring and the plug exists an annular clearance space 55. Thisclearance, which may be illustrated slightly exaggerated, results fromthedifference to taper between the surfaces. Even with space '55, thelock ring is sufficiently stiff, the diameters of undercut 46 aresufiiciently larger than the corresponding diameters of bead 26, and theforce exerted by plug 32 through its externally tapered surface 54 onthe lock ring is sufficiently high, that the intimate, compressive,sealing engagement between the undercut and the bead exists. It has beenfound that elimination of space 55 to obtain compressive engagementbetween the surfaces where the space was improves creep resistance. Thusin many applications it is preferred to eliminate space 55 entirely. 7Lock ring 42 has an annular, right cylindrical counterbore 56immediately above the upper terminus of an annular transition taperedsurface 58. Plug 32 has an external radial, externally tapered flange orrib 62, the largest diameter of which closely approaches the diameter ofcounterbore 56. Rib 62, in assembly as shown in FIG. 2, is spacedslightly above tapered transition surface 58 of lock ring 42. Thisclearance allows plug 32 to move axially further down with respect tolock ring 42 than is shown in FIG. 2 during assembly. Overtravel, aswell, is possible because of the unequal tapers between the outsidesurface of plug 32 and the inside surface of lock ring 42. Thisovertravel facility assures that external flange 52 of plug 32completely clears the bottom of lock ring 42-and the flange expands intoengagement with shoulder 50. When the dispenser is pressurized, internalpressure within the dispenser will force flange 52 against shoulder 50.The amount of engagement between the surfaces of the plug and lock ringincreases the greater the distance between shoulder 50 and flange 52.

The lock ring extends axially a relatively large distance from undercut46 to shoulder 50. This distance allows the lock ring to flex or expandas flange 52 passes through it during assembly and encountersprogressively smaller diameters along surface 48. It should also benoted that flange 52 has a maximum diameter no larger than the diameterof surface 48 radially inward of bead 26 (in other words, at the sameaxial position as the bead).

With reference again to FIG. 1, valving mechanism 16 further includes aplug 64, a stem 66, a head 68, a spring 70, a closure cap 72 and anactuator 74. Spring 70 biases plug 64 toward nozzle 40 to maintain thevalve in a normally closed position. The spring is purchased between theinside end of closure cap 72 and plug 64. The closure cap is secured toa barrel 30 through a flange, not shown. Actuator 74 is purchased onclosure cap 72 and is coupled to stem 66 through head 68.counterclockwise rotation of the actuator causes it to bear against theinterior surface of head 68 moving stem 66 to the right in the Figurealong with plug 64 to discharge product through nozzle 40. An annularfeather edged cup seal 78 contacts chamber 38 in a zonearound its entirebounding circumference and prevents product from escaping out of therear of the valve.

Dispenser is assembled by inserting lock ring 42 into hole 28, which isbounded by bead 26. This insertion will contract the lock ring until itis free to expand when undercut 46 is radially inward of bead or curl26. However, the diameter of the undercut portion is slightly largerthan the interior diameter of the bead and therefore the lock ring willbe in compressive engagement with the bead. Next, plug section 32 isforced inwardly of the lock ring and expands the lock ring below thecurl for the passage of flange 52 of the plug. The plug section itselfwill contract slightly because of the action of the lock ring on itduring insertion and even slightly when completely assembled. Upperflange or rib 62 will bottom on transition tapered surface 58 indicatingthat flange 52 has completely cleared shoulder 50 of lock ring 42. Theexternally tapered surface of the plug section will bear tightly againstthe cooperating tapered surface of the lock ring during the insertion ofthe plug into the lock ring. In any event, once flange 52 of plug 32clears the bottom of the lock ring and the dispenser is subsequentlypressurized, flange 52 will move upwardly into engagement with shoulder50.

The difference of tapers between the internal surface of the lock ringand the external surface of the plug, obviously, allows for thisovertravel facility. Notwithstanding the differences in tapers, the plugsection, when assembled, bears in compressive engagement against thelock ring to further urge the lock ring into intimate and compressiveengagement with curl or bead 26.

As previously mentioned, in a practical embodiment of the presentinvention the lock ring was made of polyethylene. The plug and thebalance of valve housing was made of polypropylene. Obviously, becauseof the contraction required of the plug section and even more so becauseof the expansion of the lock ring during assembly, the materials of eachmust be relatively resilient.

The present invention has been described with reference to a certainpreferred embodiment. The spirit and scope of the appended claims shouldnot, however, necessarily be limited to the foregoing description.

What is claimed is:

1. An improved dispensing 'valve for use with a pressurized dispenser ofthe type having a dome with an annular bead bounding an openingtherethrough into the interior of the dispenser, the improved dispensingvalve comprising:

a. a housing having as its base a plug, a longitudinal axis for lying onthe axis of the opening through the dome, and passage means for productpassage from the interior of the dispenser to atmosphere;

b. selectively actuatable valving means in the housing for selectivelydispensing product from the dispenser;

c. a lock ring having an axial bore and an annular, external groovedefining an undercut which has a surface conforming to the surface ofthe bead for sealing engagement therewith and for interference with thebead in both directions axially of the housing, the lock ring extendingaxially below the annular groove to an annular, radially extendingshoulder, the extended section of the lock ring defining an annularsection capable of flexural expansion radially outward from the axis ofthe housing below the bead;

d. the plug having an annular external flange for expanding the extendedsection of the lock ring below the annular groove and for underlying theshoulder to provide interference between the plug and the lock ring inan axially upward direction; and

. the bore in the extended section of the lock ring having an annularinternal surface and the plug having an annular external surface abovethe flange for interference with each other to radially expand theextended section and force the annular groove into intimate compressiveengagement with the bead.

2. The improved dispensing valve claimed in claim 1 wherein:

the annular internal surface of the lock ring is axially tapered withthe taper converging towards the shoulder, and the annular externalsurface of the plug is axially tapered with the taper converging towardsthe flange, the taper of the internal surface of the lock ring beinggreater than the taper of the external surface of the plug.

3. The improved dispensing valve claimed in claim 2 wherein:

the plug and the lock ring have means for permitting the flange of theplug to move axially past the shoulder of the lock ring during assemblyto ensure that the flange clears the shoulder.

4. The improved dispensing valve claimed in claim 3 wherein thepermitting means includes:

an annular rib on the plug above the externally ta pered surfacethereof, the rib having a diameter greater than the diameter of theinternally tapered surface of the lock ring, a counterbore in the lockring above the internally tapered annular surface thereof, thecounterbore having a diameter to receive the rib, a transition surfaceof the lock ring between the counterbore and the tapered annular surfaceof the lock ring, and the axial distance between the rib and the flangeexceeding the axial distance between the transition surface and theshoulder to permit the flange to move past the shoulder during assemblyuntil the rib abuts the transition surface.

5. The improved dispensing valve claimed in claim 1 wherein the diameterof the annular groove is slightly greater than the correspondingdiameter of the bead to provide radial interference between the two.

6. The improved dispensing valve claimed in claim 5 wherein:

the annular internal surface of the lock ring is axially tapered withthe taper converging towards the shoulder, and the annular externalsurface of the plug is axially tapered with the taper converging towardsthe flange, the taper of the internal surface of the lock ring beinggreater than the taper of the external surface of the plug.

7. In combination with a pressurized dispenser of the type having a domewith an annular bead bounding an opening therethrough into the interiorof the dispenser, an improved dispensing valve for the selectivedispensation of product comprising:

a. a housing having a plug at its base, a longitudinal axis, and passagemeans for product passage from the interior of the dispenser toatmosphere;

b. selectively actuable valving means in the housing for selectivelydispensing product from the dispenser;

. a lock ring having an axial bore and an annular, external groovedefining an undercut which has a surface conforming to the surface ofthe bead, the annular groove being in sealing and compressive engagementwith the bead and in interference with the bead in both longitudinaldirections of the housing to prevent the lock ring from leaving thebead, the lock ring extending axially below the annular groove to anannular, radially extending shoulder, the extended section of the lockring defining an annular section capable of flexural expansion radiallyoutward from the longitudinal axis of the housing below the bead;

d. the plug having an annular external flange for expanding the extendedsection of the lock ring below the annular groove, the annular flangeunderlying the shoulder and being in interference therewith in anupwardly direction along the longitudinal axis; and

e. the bore in the extended section of the lock ring having an annularinternal surface and the plug having an annular external surface abovethe flange, the two surfaces being in interference with each other withthe plug radially expanding the extended section of thelock ring andforcing the an nular groove into intimate compressive engagement withthe bead.

8. The improved dispensing valve claimed in claim 7 wherein:

the annular internal surface of the lock ring is axially tapered withthe taper converging towards the shoulder, and the annular externalsurface of the plug is axially tapered with the taper converging towardsthe flange, the taper of the internal surface of the lock ring beinggreater than the taper of the external surface of the plug.

9. The improved dispensing valve claimed in claim 8 wherein the plug andthe lock ring each has means for permitting the flange of the plug tomove axially past the shoulder of the lock ring during assembly toensure that the flange clears the shoulder.

10. The improved dispensing valve claimed in claim 9 wherein thepermitting means of the plug and lock ring includes:

an annular rib on the plug above the externally tapered surface thereof,the rib having a diameter greater than the diameter of the internallytapered surface of the lock ring, a counterbore in the lock ring abovethe internally tapered annular surface thereof and receiving the rib, atransition surface of the lock ring between the counterbore and thetapered annular surface of the lock ring, the axial distance between therib and the flange exceeding the axial distance between the transitionsurface and the shoulder to permit the flange to move past the shoulderduring assembly until the rib abuts the transition surface.

an annular rib on the plug above the externally tapered surface thereof,the rib having a diameter greater than the diameter of the internallytapered surface of the lock ring, a counterbore in the lock ring abovethe internally tapered annular surface thereof and receiving the rib, atransition surface of the lock ring between the counterbore and thetapered annular surface of the lock ring, the axial distance between therib and the flange exceeding the axial distance between the transitionsurface and the shoulder to permit the flange to move past the shoulderduring assembly until the rib abutsthe transition surface.

27 g UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No.3,746,218 Dated July 17. 1973 Igventor s Merle G. Risdon and Ronald A.Meyer It is certified that error appears in the above-identified patentand that said Letters Patent are hereby corrected as shown below:

I" I "I In the Specification: Column 2 line 19, "comprimise" should be--compromise--.

In the Claims: Claim 7, column 7, line 29, "actuable" should be--actuatable--. Claim 10, colunm 8, lines 38 through 50 should bedeleted.

Signed and sealed this 2nd day of April 197b,.

(SEAL) Attest:

EDWARD I LFLETGHEILJR. C. MARSHALL DANN Attesting Officer Commissionerof Patents

1. An improved dispensing valve for use with a pressurized dispenser ofthe type having a dome with an annular bead bounding an openingtherethrough into the interior of the dispenser, the improved dispensingvalve comprising: a. a housing having as its base a plug, a longitudinalaxis for lying on the axis of the opening through the dome, and passagemeans for product passage from the interior of the dispenser toatmosphere; b. selectively actuatable valving means in the housing forselectively dispensing product from the dispenser; c. a lock ring havingan axial bore and an annular, external groove defining an undercut whichhas a surface conforming to the surface of the bead for sealingengagement therewith and for interference with the bead in bothdirections axially of the housing, the lock ring extending axially belowthe annular groove to an annular, radially extending shoulder, theextended section of the lock ring defining an annular section capable offlexural expansion radially outward from the axis of the housing belowthe bead; d. the plug having an annular external flange for expanDingthe extended section of the lock ring below the annular groove and forunderlying the shoulder to provide interference between the plug and thelock ring in an axially upward direction; and e. the bore in theextended section of the lock ring having an annular internal surface andthe plug having an annular external surface above the flange forinterference with each other to radially expand the extended section andforce the annular groove into intimate compressive engagement with thebead.
 2. The improved dispensing valve claimed in claim 1 wherein: theannular internal surface of the lock ring is axially tapered with thetaper converging towards the shoulder, and the annular external surfaceof the plug is axially tapered with the taper converging towards theflange, the taper of the internal surface of the lock ring being greaterthan the taper of the external surface of the plug.
 3. The improveddispensing valve claimed in claim 2 wherein: the plug and the lock ringhave means for permitting the flange of the plug to move axially pastthe shoulder of the lock ring during assembly to ensure that the flangeclears the shoulder.
 4. The improved dispensing valve claimed in claim 3wherein the permitting means includes: an annular rib on the plug abovethe externally tapered surface thereof, the rib having a diametergreater than the diameter of the internally tapered surface of the lockring, a counterbore in the lock ring above the internally taperedannular surface thereof, the counterbore having a diameter to receivethe rib, a transition surface of the lock ring between the counterboreand the tapered annular surface of the lock ring, and the axial distancebetween the rib and the flange exceeding the axial distance between thetransition surface and the shoulder to permit the flange to move pastthe shoulder during assembly until the rib abuts the transition surface.5. The improved dispensing valve claimed in claim 1 wherein the diameterof the annular groove is slightly greater than the correspondingdiameter of the bead to provide radial interference between the two. 6.The improved dispensing valve claimed in claim 5 wherein: the annularinternal surface of the lock ring is axially tapered with the taperconverging towards the shoulder, and the annular external surface of theplug is axially tapered with the taper converging towards the flange,the taper of the internal surface of the lock ring being greater thanthe taper of the external surface of the plug.
 7. In combination with apressurized dispenser of the type having a dome with an annular beadbounding an opening therethrough into the interior of the dispenser, animproved dispensing valve for the selective dispensation of productcomprising: a. a housing having a plug at its base, a longitudinal axis,and passage means for product passage from the interior of the dispenserto atmosphere; b. selectively actuable valving means in the housing forselectively dispensing product from the dispenser; c. a lock ring havingan axial bore and an annular, external groove defining an undercut whichhas a surface conforming to the surface of the bead, the annular groovebeing in sealing and compressive engagement with the bead and ininterference with the bead in both longitudinal directions of thehousing to prevent the lock ring from leaving the bead, the lock ringextending axially below the annular groove to an annular, radiallyextending shoulder, the extended section of the lock ring defining anannular section capable of flexural expansion radially outward from thelongitudinal axis of the housing below the bead; d. the plug having anannular external flange for expanding the extended section of the lockring below the annular groove, the annular flange underlying theshoulder and being in interference therewith in an upwardly directionalong the longitudinal axis; and e. the bore in the extended section ofthe lock ring having an annular internal surface and the plug having anannular external surface above the flange, the two surfaces being ininterference with each other with the plug radially expanding theextended section of the lock ring and forcing the annular groove intointimate compressive engagement with the bead.
 8. The improveddispensing valve claimed in claim 7 wherein: the annular internalsurface of the lock ring is axially tapered with the taper convergingtowards the shoulder, and the annular external surface of the plug isaxially tapered with the taper converging towards the flange, the taperof the internal surface of the lock ring being greater than the taper ofthe external surface of the plug.
 9. The improved dispensing valveclaimed in claim 8 wherein the plug and the lock ring each has means forpermitting the flange of the plug to move axially past the shoulder ofthe lock ring during assembly to ensure that the flange clears theshoulder.
 10. The improved dispensing valve claimed in claim 9 whereinthe permitting means of the plug and lock ring includes: an annular ribon the plug above the externally tapered surface thereof, the rib havinga diameter greater than the diameter of the internally tapered surfaceof the lock ring, a counterbore in the lock ring above the internallytapered annular surface thereof and receiving the rib, a transitionsurface of the lock ring between the counterbore and the tapered annularsurface of the lock ring, the axial distance between the rib and theflange exceeding the axial distance between the transition surface andthe shoulder to permit the flange to move past the shoulder duringassembly until the rib abuts the transition surface. an annular rib onthe plug above the externally tapered surface thereof, the rib having adiameter greater than the diameter of the internally tapered surface ofthe lock ring, a counterbore in the lock ring above the internallytapered annular surface thereof and receiving the rib, a transitionsurface of the lock ring between the counterbore and the tapered annularsurface of the lock ring, the axial distance between the rib and theflange exceeding the axial distance between the transition surface andthe shoulder to permit the flange to move past the shoulder duringassembly until the rib abuts the transition surface.